An organic light emitting display capable of displaying an image with uniform brightness is provided. The display includes a scan driver, a data driver, pixels, an initial power source line coupled to an initial power source, a bias power source line coupled to a bias power source, horizontal power lines, first switching elements, and second switching elements. Each of the pixels includes a driving transistor for controlling an amount of current that flows from a first power source. The bias power source has a different voltage from the initial power source. The first switching elements are coupled between the horizontal power source lines and the initial power source line. The second switching elements are coupled between the horizontal power source lines and the bias power source line. The second switching elements are configured to alternately turn on and off with the first switching elements.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An organic light emitting display comprising: a scan driver for supplying a first scan signal to first scan lines, a second scan signal to second scan lines, and emission control signals to emission control lines; a data driver for supplying data signals to data lines; an initial power source line coupled to an initial power source; a bias power source line coupled to a bias, power source having a different voltage from that of the initial power source; pixels at crossing regions of the data lines and horizontal power source lines extending in parallel with and corresponding to the first scan lines, the horizontal power source lines being configured to couple the pixels to the initial power source and the bias power source, each of the pixels comprising a driving transistor for controlling an amount of current that flows from a first power source to an organic light emitting diode (OLED) in accordance with one of the data signals; first switching elements coupled between the horizontal power source lines and the initial power source line, each of the first switching elements comprising one terminal connected to one of the horizontal power source lines and another terminal connected to the initial power source line; and second switching elements coupled between the horizontal power source lines and the bias power source line, the second switching elements being configured to alternately turn on and off with the first switching elements, each of the second switching elements comprising one terminal connected to one of the horizontal power source lines and another terminal connected to the bias power source line.
2. The organic light emitting display as claimed in claim 1 , wherein the initial power source has a lower voltage than the data signals.
3. The organic light emitting display as claimed in claim 1 , wherein the bias power source has a higher voltage than a voltage obtained by subtracting a threshold voltage of the driving transistor from a voltage of the first power source.
4. The organic light emitting display as claimed in claim 1 , wherein the data driver is configured to supply the data signals concurrently with the first scan signal.
5. The organic light emitting display as claimed in claim 1 , wherein the scan driver is configured to supply two second-scan signals to the second scan lines in one frame.
6. The organic light emitting display as claimed in claim 5 , wherein the scan driver is further configured to supply the first scan signal to one of the first scan lines after supplying a second of the two second-scan signals to a corresponding one of the second scan lines.
7. The organic light emitting display as claimed in claim 5 , wherein the scan driver is further configured to supply one of the emission control signals to one of the emission control lines to overlap a second of the two second-scan signals supplied to a corresponding one of the second scan lines and to overlap the first scan signal supplied to a corresponding one of the first scan lines.
8. The organic light emitting display as claimed in claim 7 , further comprising: first control lines coupled to the first switching elements; second control lines coupled to the second switching elements; and a switching driver for supplying: a first control signal to the first control lines for turning on the first switching elements; and a second control signal to the second control lines for turning on the second switching elements.
9. The organic light emitting display as claimed in claim 8 , wherein the switching driver is configured to supply the first control signal to one of the first control lines to overlap the one of the emission control signals supplied to the one of the emission control lines.
10. The organic light emitting display as claimed in claim 8 , wherein the switching driver is configured to supply the second control signal to one of the second control lines to overlap a first of the two second-scan signals supplied to the corresponding one of the second scan lines.
11. The organic light emitting display as claimed in claim 1 , wherein each of the pixels further comprises: the OLED; and a second transistor coupled between a gate electrode of the driving transistor and one of the horizontal power source lines, the second transistor being configured to turn on when the second scan signal is supplied to a corresponding one of the second scan lines.
12. The organic light emitting display as claimed in claim 11 , wherein each of the pixels further comprises: a third transistor coupled between a second electrode of the driving transistor and the gate electrode of the driving transistor, the third transistor being configured to turn on when the first scan signal is supplied to a corresponding one of the first scan lines; a fourth transistor coupled between a first electrode of the driving transistor and one of the data lines, the fourth transistor being configured to turn on when the first scan signal is supplied to the corresponding one of the first scan lines; a fifth transistor coupled between the first electrode of the driving transistor and the first power source, the fifth transistor being configured to turn off when one of the emission control signals is supplied to a corresponding one of the emission control lines; a sixth transistor coupled between the second electrode of the driving transistor and the OLED, the sixth transistor being configured to turn off when the one of the emission control signals is supplied to the corresponding one of the emission control lines; and a storage capacitor coupled between the gate electrode of the driving transistor and the first power source.
13. An organic light emitting display comprising: a scan driver for supplying scan signals to scan lines and for supplying emission control signals to emission control lines; a data driver for supplying data signals to data lines; an initial power source line coupled to an initial power source; a bias power source line coupled to a bias power source having a different voltage from that of the initial power source; pixels at crossing regions of the data lines and horizontal power source lines extending in parallel with and corresponding to the scan lines, the horizontal power source lines being configured to couple the pixels to the initial power source and the bias power source, each of the pixels comprising a driving transistor for controlling an amount of current that flows from a first power source to an organic light emitting diode (OLED) in accordance with one of the data signals; first switching elements coupled between the horizontal power source lines and the initial power source line, each of the first switching elements comprising one terminal connected to one of the horizontal power source lines and another terminal connected to the initial power source line; and second switching elements coupled between the horizontal power source lines and the bias power source line, the second switching elements being configured to alternately turn on and off with the first switching elements, each of the second switching elements comprising one terminal connected to one of the horizontal power source lines and another terminal connected to the bias power source line.
14. The organic light emitting display as claimed in claim 13 , wherein the initial power source has a lower voltage than the data signals.
15. The organic light emitting display as claimed in claim 13 , wherein the bias power source has a higher voltage than a voltage obtained by subtracting a threshold voltage of the driving transistor from a voltage of the first power source.
16. The organic light emitting display as claimed in claim 13 , wherein the scan driver is configured to supply two scan signals to the scan lines in one frame.
17. The organic light emitting display as claimed in claim 16 , wherein the scan driver is further configured to supply one of the emission control signals to one of the emission control lines to overlap one of the scan signals supplied to a corresponding one of the scan lines and to overlap the one of the scan signals supplied to a corresponding previous one of the scan lines.
18. The organic light emitting display as claimed in claim 17 , further comprising: first control lines coupled to the first switching elements; second control lines coupled to the second switching elements; and a switching driver for supplying: a first control signal to the first control lines for turning on the first switching elements; and a second control signal to the second control lines for turning on the second switching elements.
19. The organic light emitting display as claimed in claim 18 , wherein the switching driver is configured to supply: the second control signal to one of the second control lines to overlap a first of the two scan signals supplied to the corresponding one of the scan lines and to the corresponding previous one of the scan lines; and the first control signal to one of the first control lines to overlap a second of the two scan signals supplied to the corresponding one of the scan lines and to the corresponding previous one of the scan lines.
20. The organic light emitting display as claimed in claim 13 , wherein each of the pixels further comprises: the OLED; and a second transistor coupled between a gate electrode of the driving transistor and one of the horizontal power source lines, the second transistor being configured to turn on when one of the scan signals is supplied to a corresponding previous one of the scan lines.
21. The organic light emitting display as claimed in claim 20 , wherein each of the pixels further comprises: a third transistor coupled between a second electrode of the driving transistor and the gate electrode of the driving transistor, the third transistor being configured to turn on when the one of the scan signals is supplied to a corresponding one of the scan lines; a fourth transistor coupled between a first electrode of the driving transistor and one of the data lines, the fourth transistor being configured to turn on when the one of the scan signals is supplied to the corresponding one of the scan lines; a fifth transistor coupled between the first electrode of the driving transistor and the first power source, the fifth transistor being configured to turn off when one of the emission control signals is supplied to a corresponding one of the emission control lines; a sixth transistor coupled between the second electrode of the driving transistor and the OLED, the sixth transistor being configured to turn off when the one of the emission control signals is supplied to the corresponding one of the emission control lines; and a storage capacitor coupled between the gate electrode of the driving transistor and the first power source.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 9, 2011
August 5, 2014
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